Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. Use short, direct traces for the analog inputs and outputs, and avoid running digital signals near the analog pins. Additionally, use a low-ESR capacitor for the AVDD pin and a 10uF capacitor for the REF pin.
For differential input mode, connect the positive input signal to the IN+ pin and the negative input signal to the IN- pin. For pseudo-differential input mode, connect the input signal to the IN+ pin and the reference voltage to the IN- pin. Ensure the input common-mode voltage is within the specified range (0.5V to 2.5V) and the input differential voltage is within the specified range (-Vref to Vref).
The recommended clock frequency is between 1MHz and 4MHz. The clock signal should have a 50% duty cycle and be synchronized with the conversion process. Ensure the clock signal is stable and has minimal jitter to ensure accurate conversions.
The internal reference voltage is enabled by default. To use an external reference voltage, connect the external reference voltage to the REF pin and ensure it is within the specified range (2.5V to 5.5V). The internal reference voltage can be disabled by connecting the REF pin to the AVDD pin.
Power-on sequencing: Apply AVDD first, followed by the clock signal, and then the input signals. Power-down sequencing: Remove the input signals, then the clock signal, and finally AVDD. Ensure a minimum of 10us delay between each step to prevent damage to the device.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
